//演示一个线程不安全的代码
class Counter{
    public int count = 0;
    public synchronized void increase(){ //synchronized加锁
        count++;
    }

}
public class demo1 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        Thread t1 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });
        Thread t2 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });
        t1.start();
        t2.start();

        t1.join();
        t2.join();
        System.out.println("Counter:"+counter.count);
    }
}
